<form action="" method="post">
    <p>
        <label>Page title:</label>
        <? if (!preg_match("/^special:/", $this->title)) { ?>
        <input type="text" name="title" value="<?= $this->title ?>" />
        <? } else { ?>
        <input type="hidden" name="title" value="<?= $this->title ?>" />
        <b><?= $this->title ?></b>
        <? } ?>
    </p>
    <p>
        <textarea name="body"><?= $this->body ?></textarea>
    </p>
    <p>
        <input type="hidden" name="id" value="<?= $this->id ?>" />
        <input type="submit" value="Save page" />
    </p>
</form>